20123212019 has 2 divisors, whose sum is σ = 20123212020. Its totient is φ = 20123212018.

The previous prime is 20123212007. The next prime is 20123212033. The reversal of 20123212019 is 91021232102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20123212019 - 2²⁰ = 20122163443 is a prime.

It is a super-2 number, since 2×20123212019² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 20123211985 and 20123212003.

It is not a weakly prime, because it can be changed into another prime (20123212079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061606009 + 10061606010.

It is an arithmetic number, because the mean of its divisors is an integer number (10061606010).

Almost surely, 2^20123212019 is an apocalyptic number.

20123212019 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123212019 is an equidigital number, since it uses as much as digits as its factorization.

20123212019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 20123212019 in words is "twenty billion, one hundred twenty-three million, two hundred twelve thousand, nineteen".